CN110671201A - Worm and gear driven mechanism with variable connecting rod length and variable compression ratio - Google Patents
Worm and gear driven mechanism with variable connecting rod length and variable compression ratio Download PDFInfo
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- CN110671201A CN110671201A CN201911101402.XA CN201911101402A CN110671201A CN 110671201 A CN110671201 A CN 110671201A CN 201911101402 A CN201911101402 A CN 201911101402A CN 110671201 A CN110671201 A CN 110671201A
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- connecting rod
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- eccentric
- compression ratio
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- 230000006835 compression Effects 0.000 title claims abstract description 44
- 238000007906 compression Methods 0.000 title claims abstract description 44
- 230000007246 mechanism Effects 0.000 title claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 239000013520 petroleum-based product Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/03—Controlling by changing the compression ratio
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a turbine worm driving type variable connecting rod length and variable compression ratio mechanism, which comprises a connecting rod small end, an eccentric connecting rod bush, a worm, a driven gear, a driving motor, a connecting rod body, a bearing end cover, a bearing and the like, and is characterized in that: the eccentric connecting rod bushing is arranged in a small end hole of the connecting rod, an eccentric hole of the eccentric connecting rod bushing is used for installing a piston pin, a worm is arranged in a round hole processed in the small end of the connecting rod, the worm is meshed with an arc gear at the middle position of the eccentric connecting rod bushing to form a worm and gear transmission system, a driving motor is arranged in a connecting rod body and is controlled by an electric control system, the driving motor drives the worm and gear system through the gear transmission system to enable the eccentric connecting rod bushing to rotate, the linear distance from the axis of the piston pin hole to a crankshaft neck is further changed, and the length of the connecting rod is changed, so.
Description
Technical Field
The invention relates to a vehicle engine part, in particular to a worm and gear driving type variable connecting rod length and compression ratio mechanism.
Background
The reserved automobile output has great potential, opportunities and challenges are brought to the development of engines, and although new energy automobiles are distinguished in recent years, the market of mainstream internal combustion engine automobiles is still shocked. The internal combustion engine has the advantages of light weight, high energy density, high thermal efficiency, good fuel adaptability, reliable performance and the like. Most engines currently use petroleum-based products as the primary fuel source. Therefore, as the automobile holding capacity increases year by year, the energy safety problem becomes more serious, and higher requirements are also put on the engine, and factors influencing the thermal efficiency of the internal combustion engine are numerous, wherein the compression ratio is an important factor influencing the thermal efficiency and the fuel economy of the engine. The compression ratio of the engine is the ratio of the volume of the cylinder when the piston moves to the bottom dead center to the volume of the cylinder when the piston moves to the top dead center, and the heat efficiency of the engine can be effectively improved by increasing the compression ratio. Generally, the higher the compression ratio of the engine is, the longer the piston power stroke is, the more power is applied, and the larger the output power is. However, excessive compression ratios in gasoline engines can lead to uncontrolled combustion, damaging the engine and prone to knock when the load is relatively high; the excessive compression ratio in the diesel engine causes the cylinder pressure of the diesel engine to be too high, so that the vibration noise is aggravated, and the impact load born by a moving part is increased, thereby influencing the working reliability and the service life of the diesel engine.
In order to avoid the above situation, a variable compression ratio technology is introduced, which is considered as one of the most effective means for improving the thermal efficiency of the engine and improving the fuel economy, and the compression ratio can be increased at the time of low rotation so as to improve the thermal efficiency of the engine; and the compression ratio is reduced during high rotation, so that the knocking of the gasoline engine and the rough work of the diesel engine are reduced.
With variable compression ratio technology it is possible to:
1. the combustion of the engine is optimized, the larger compression ratio is adopted under partial load, the residual coefficient of waste gas is reduced, and the combustion heat efficiency is improved.
2. The adaptability of the engine to fuel is enhanced, for a gasoline engine, generally speaking, a specific vehicle type needs to add gasoline of a specific model to ensure that no knocking occurs, and the price of high-grade gasoline is high.
3. Is favorable for improving the turbocharging performance of the supercharged gasoline engine. Because the start-up in-process of pressure boost gasoline engine, the rotational speed is low, and waste gas energy is lower, and turbocharging system does not intervene work when low rotational speed, and the application compression ratio technology of variably compressing can improve exhaust energy undoubtedly, helps making turbocharging system intervene rapidly.
4. The engine is convenient to be miniaturized and designed in a light weight mode.
Disclosure of Invention
The invention provides a worm and gear driving type variable connecting rod length and variable compression ratio mechanism, which is reliable in work, small in part change and low in research and development cost. However, the invention only relates to the change of the compression ratio of two sections, and cannot achieve the effect of stepless variable compression ratio.
In order to achieve the purpose, the invention adopts the technical scheme that:
a worm and gear driven variable connecting rod length and variable compression ratio mechanism comprises a connecting rod small end, an eccentric connecting rod bushing, a worm, a driven gear, a driving motor, a connecting rod body, a bearing end cover and a bearing. The method is characterized in that:
the eccentric connecting rod bushing is installed in a connecting rod small end hole, an eccentric hole of the eccentric connecting rod bushing is used for installing a piston pin, a connecting rod small end is connected with a connecting rod body through threads, a blind hole is machined in the connecting rod body and provided with a driving motor, an output shaft of the driving motor is connected with a driving gear, the driving gear is positioned through two bearings, the driving gear is meshed with a driven gear, a lower end shaft of a worm is connected with the driven gear, the worm is installed in a round hole machined in the connecting rod small end, the upper end and the lower end of the worm are fixed in position through a bearing and a bearing end cover, and the worm is meshed with an arc gear machined on the.
The worm and gear driven variable connecting rod length and variable compression ratio mechanism is characterized in that the circle center of a piston pin hole of an eccentric connecting rod bush is not concentric with the circle center of the excircle of the eccentric connecting rod bush, the distance between the circle center of the excircle and the circle center of the piston pin hole is d, an arc-shaped gear is machined in the middle of the eccentric connecting rod bush along the circumference, and the diameter of the top circle of the gear is smaller than that of the excircle of the eccentric connecting rod bush.
The worm and gear driven variable connecting rod length and variable compression ratio mechanism is characterized in that round holes are machined in the small end of the connecting rod and used for mounting a worm, a driving gear and a driven gear, and the gear and the worm are positioned through a bearing or a bearing end cover.
The worm and gear driving type variable connecting rod length and variable compression ratio mechanism is characterized in that the connecting rod is divided into two parts, one part is a connecting rod small end, the other part is a connecting rod body, and the two parts are connected through threads.
The worm and gear driven variable connecting rod length and variable compression ratio mechanism is characterized in that the worm and the arc-shaped gear in the middle of the eccentric connecting rod bushing form a worm and gear transmission system, and the eccentric connecting rod bushing is positioned by fixing the position of the worm.
The worm and gear driven variable connecting rod length and variable compression ratio mechanism is characterized in that a driving motor is arranged in a connecting rod body, an output shaft of the driving motor is connected with a driving gear, the driving gear is meshed with a driven gear, the driven gear is connected with a worm shaft, a worm and gear transmission system is driven through the driving motor, and the motor is controlled through an electric control system.
According to the variable compression ratio piston connecting rod assembly driven by the eccentric shaft sleeve, a piston pin hole of an eccentric connecting rod bushing is in interference fit with a piston pin, and the eccentric connecting rod bushing is in clearance fit with a small end hole of a connecting rod. The side of the driving eccentric shaft sleeve in the piston is provided with a square hole, and the worm is arranged in the square hole and is matched with the gear in the middle of the driving eccentric shaft sleeve.
Compared with the prior art, the invention has the beneficial effects that:
1. the worm and gear driven variable connecting rod length and variable compression ratio mechanism provided by the invention is composed of parts such as an eccentric connecting rod bush, a worm, a gear, a motor and the like, and is simple in structure and easy to process and install.
2. The worm and gear driven variable connecting rod length and variable compression ratio mechanism only changes the structure of the upper half part of the connecting rod, avoids the change of large parts such as a cylinder cover, a machine body and a crankshaft, and reduces the design cost.
Drawings
The invention is further described with reference to the accompanying drawings in which:
fig. 1 is a front sectional view of the variable-length link variable compression ratio mechanism at a high compression ratio.
Fig. 2 is a front sectional view of the variable-length link variable compression ratio mechanism at a low compression ratio.
Fig. 3 is a front sectional view of the eccentric link bushing.
Fig. 4 is a side view of an eccentric link bushing.
Fig. 5 is an enlarged sectional view of fig. 1B.
FIG. 6 is an enlarged cross-sectional view of FIG. 1A
Description of reference numerals:
the device comprises a connecting rod small end 1, an eccentric connecting rod bushing 2, a worm 3, a driven gear 4, a driving gear 5, a driving motor 6, a connecting rod body 7, a bearing end cover 8 and a bearing 9.
Detailed Description
The invention will now be described in detail with reference to the following description of the drawings, which is one preferred embodiment of several embodiments.
As shown in fig. 1, 3 and 4, the connecting rod eccentric bushing 2 is a cylinder structure with a piston pin hole, the center of the piston pin hole is not coincident with the center of the outer circle of the connecting rod eccentric bushing 2, the parallel distance between the two centers is d, a circle of arc-shaped gear is processed at the middle position of the connecting rod eccentric bushing 2 as shown in the figure, the diameter of the addendum circle of the gear is smaller than that of the outer circle of the eccentric connecting rod bushing 2, the gear is used for being meshed with the worm 3 to form a worm and gear transmission system, the gear is processed on the connecting rod eccentric bushing 2 so as to drive the connecting rod eccentric bushing 2 to rotate, and meanwhile, the worm 3 is meshed with the arc-shaped gear to position.
As shown in fig. 1, 5 and 6, the connecting rod is divided into two parts, one part is a small connecting rod head 1, the other part is a connecting rod body 7, the two parts are connected by screw threads, the two parts are convenient to process, a blind hole for installing a driving motor 6 and a round hole of a bearing 9 are processed inside the connecting rod body 7, round holes are processed inside the small connecting rod head 1 for placing a worm 3 and a driving gear 5 and a driven gear 4, an output shaft of the driving motor 6 is connected with the driving gear 5, the driving gear is positioned by an upper bearing 9 and a lower bearing 9, the two bearings 9 are respectively installed in the round holes of the connecting rod body 7 and the small connecting rod head 1, the driving gear 5 is meshed with the driven gear 4 for force transmission, a lower end shaft of the worm 3 is combined with the driven gear 4, the driven gear 4 is fixed in position under the action of the lower end shaft, the upper end shaft of the worm is fixed in position under the combined action of the bearing 9 and the bearing end cover 8, and the driving motor 6 drives the worm 3 to rotate.
As shown in fig. 1 and 2, the engine is in a high compression ratio state, the worm gear system does not work, the connecting rod small head 1, the eccentric connecting rod bushing 2, the worm gear 3 and the three keep a relative static state, the circle center of the piston pin hole is positioned above the circle center of the excircle of the eccentric connecting rod bushing 2, and the parallel distance between the two circle centers is d and is called as an eccentric distance. The process of changing the engine from high compression ratio to low compression ratio. When the top dead center position of the power stroke is reached, the driving motor 6 works under the control of the electric control system, the driving motor 6 firstly drives the gear transmission system and then drives the worm 3 to rotate through the system, the worm 3 drives the eccentric connecting rod bush to rotate through being meshed with the arc-shaped gear of the eccentric connecting rod bush 2, the eccentric connecting rod bush 2 rotates 180 degrees to enable the piston pin hole position to move from the dotted line position to the solid line position, then the motor stops working, the worm gear system is self-locked, the length of the connecting rod is changed, and the engine finishes the conversion from the high compression ratio to the low compression ratio.
Claims (7)
1. A worm and gear driven variable connecting rod length variable compression ratio mechanism comprises a connecting rod small end (1), an eccentric connecting rod bush (2), a worm (3), a driven gear (4), a driving gear (5), a driving motor (6), a connecting rod body (7), a bearing end cover (8) and a bearing (9), and is characterized in that the original connecting rod bush is designed into the eccentric connecting rod bush (2) to be installed in a hole of the connecting rod small end (1), an eccentric hole of the eccentric connecting rod bush (2) is used for installing a piston pin, the connecting rod small end (1) is connected with the connecting rod body (7) through a thread, the driving motor (6) is installed in a blind hole processed inside the connecting rod body (7), an output shaft of the driving motor (6) is connected with the driving gear (5), the driving gear (5) is positioned through two bearings (9), and the driving gear (5) is meshed with the driven gear (4, a lower end shaft of the worm (3) is connected with the driven gear (4), the worm (3) is installed in a circular hole machined in the small end (1) of the connecting rod, the upper end and the lower end of the worm (3) are fixed in position through a bearing (9) and a bearing end cover (8), and the worm (3) is meshed with an arc gear machined in the outer side of the eccentric connecting rod bushing (2).
2. The worm and gear driven variable connecting rod length variable compression ratio mechanism as claimed in claim 1, characterized in that the center of the piston pin hole of the eccentric connecting rod bush (2) is not concentric with the center of the outer circle of the eccentric connecting rod bush (2), the distance between the center of the outer circle and the center of the piston pin hole is d, an arc gear is machined along the circumference at the middle position of the eccentric connecting rod bush (2), and the diameter of the top circle of the gear is smaller than the diameter of the outer circle of the eccentric connecting rod bush (2).
3. The worm and gear driving type variable connecting rod length and compression ratio mechanism as claimed in claim 1, characterized in that the small end (1) of the connecting rod is provided with a round hole for mounting the worm (3), the driving gear (5) and the driven gear (4), and the gear and the worm (3) are positioned through a bearing (9) or a bearing end cover (8).
4. The worm gear and worm drive type variable connecting rod length and compression ratio mechanism as claimed in claim 1, wherein the connecting rod is divided into two parts, one part is the small connecting rod head (1) and the other part is the connecting rod body (7), and the two parts are connected through threads.
5. The worm-and-gear drive type variable link length and compression ratio mechanism as claimed in claim 1, wherein the worm gear (3) and the arc gear at the middle position of the eccentric link bush (2) form a worm-and-gear (3) transmission system, and the eccentric link bush (2) is positioned by utilizing the fixed position of the worm gear (3).
6. The worm and gear driven variable connecting rod length and variable compression ratio mechanism as claimed in claim 1, characterized in that the connecting rod body (7) is internally provided with a driving motor (6), an output shaft of the driving motor (6) is connected with a driving gear (5), the driving gear (5) is meshed with a driven gear (4), the driven gear (4) is connected with a worm shaft (3), and a worm and gear transmission system is driven by the driving motor (6).
7. The eccentric bushing driven variable compression ratio piston and connecting rod assembly according to claim 1, wherein the piston pin hole of the eccentric connecting rod bushing (2) is in interference fit with the piston pin, and the eccentric connecting rod bushing (2) is in clearance fit with the connecting rod small end (1) hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911101402.XA CN110671201A (en) | 2019-11-12 | 2019-11-12 | Worm and gear driven mechanism with variable connecting rod length and variable compression ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911101402.XA CN110671201A (en) | 2019-11-12 | 2019-11-12 | Worm and gear driven mechanism with variable connecting rod length and variable compression ratio |
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| Publication Number | Publication Date |
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| CN110671201A true CN110671201A (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911101402.XA Pending CN110671201A (en) | 2019-11-12 | 2019-11-12 | Worm and gear driven mechanism with variable connecting rod length and variable compression ratio |
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| CN (1) | CN110671201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113580008A (en) * | 2021-08-20 | 2021-11-02 | 上海新钐机床有限公司 | Reciprocating motion device and grinding wheel frame comprising same |
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| DE102017108888A1 (en) * | 2017-04-26 | 2018-10-31 | Schaeffler Technologies AG & Co. KG | Connecting rod of a reciprocating engine |
| CN208169323U (en) * | 2018-04-04 | 2018-11-30 | 吉林大学 | A kind of motor-driven variable length link of guide |
| CN110552793A (en) * | 2019-10-09 | 2019-12-10 | 吉林大学 | Stepless eccentric wheel type variable compression ratio piston |
| CN211874601U (en) * | 2019-11-12 | 2020-11-06 | 吉林大学 | Worm and gear driven mechanism with variable connecting rod length and variable compression ratio |
-
2019
- 2019-11-12 CN CN201911101402.XA patent/CN110671201A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201377356Y (en) * | 2009-04-21 | 2010-01-06 | 张志强 | VCR device of automotive engine |
| JP2011017309A (en) * | 2009-07-10 | 2011-01-27 | Nissan Motor Co Ltd | Double-link type piston-crank mechanism of internal combustion engine and method of designing the same |
| CN102465771A (en) * | 2010-11-18 | 2012-05-23 | 现代自动车株式会社 | Variable compression ratio apparatus |
| CN107882633A (en) * | 2016-09-30 | 2018-04-06 | 伊希欧1控股有限公司 | The hydraulic means and connecting rod of the hydraulic switch valve of the connecting rod of variable compression ratio internal combustion engine |
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| CN113580008A (en) * | 2021-08-20 | 2021-11-02 | 上海新钐机床有限公司 | Reciprocating motion device and grinding wheel frame comprising same |
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